From: Dai Ngo Date: Thu, 29 Oct 2020 19:07:15 +0000 (-0400) Subject: NFSD: Fix use-after-free warning when doing inter-server copy X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~730^2~4 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=36e1e5ba90fb3fba6888fae26e4dfc28bf70aaf1;p=linux.git NFSD: Fix use-after-free warning when doing inter-server copy The source file nfsd_file is not constructed the same as other nfsd_file's via nfsd_file_alloc. nfsd_file_put should not be called to free the object; nfsd_file_put is not the inverse of kzalloc, instead kfree is called by nfsd4_do_async_copy when done. Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy") Signed-off-by: Dai Ngo Signed-off-by: J. Bruce Fields --- diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index ad2fa1a8e7ad..9c43cad7e408 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1299,7 +1299,7 @@ nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src, struct nfsd_file *dst) { nfs42_ssc_close(src->nf_file); - nfsd_file_put(src); + /* 'src' is freed by nfsd4_do_async_copy */ nfsd_file_put(dst); mntput(ss_mnt); }